What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?
Abstract
The surface densities of molecular gas, ΣH2, and the star formation rate (SFR), Σ*, correlate almost linearly on kiloparsec scales in observed star-forming (non-starburst) galaxies. We explore the origin of the linear slope of this correlation using a suite of isolated galaxy L* simulations. We show that in simulations with efficient feedback, the slope of the Σ* – ΣH2 relation on kiloparsec scales is insensitive to the slope of the ρ* – ρ relation assumed at the resolution scale. We also find that the slope on kiloparsec scales depends on the criteria used to identify star-forming gas, with a linear slope arising in simulations that identify star-forming gas using a virial parameter threshold. This behavior can be understood using a simple theoretical model based on conservation of interstellar gas mass as the gas cycles between atomic, molecular, and star-forming states under the influence of feedback and dynamical processes. In particular, we show that the linear slope emerges when feedback efficiently regulates and stirs the evolution of dense, molecular gas. As a result we show that the model also provides insights into the likely origin of the relation between the SFR and molecular gas in real galaxies on different scales.
- Authors:
-
[1];
[1];
- The Univ. of Chicago, Chicago, IL (United States)
- The Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1510809
- Report Number(s):
- arXiv:1809.07328; FERMILAB-PUB-18-757-A
Journal ID: ISSN 1538-4357; 1715029
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 870; Journal Issue: 2; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: evolution; ISM: kinematics and dynamics; methods: numerical; stars: formation
Citation Formats
Semenov, Vadim A., Kravtsov, Andrey V., and Gnedin, Nickolay Y. What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?. United States: N. p., 2019.
Web. doi:10.3847/1538-4357/aaf163.
Semenov, Vadim A., Kravtsov, Andrey V., & Gnedin, Nickolay Y. What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?. United States. https://doi.org/10.3847/1538-4357/aaf163
Semenov, Vadim A., Kravtsov, Andrey V., and Gnedin, Nickolay Y. Thu .
"What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?". United States. https://doi.org/10.3847/1538-4357/aaf163. https://www.osti.gov/servlets/purl/1510809.
@article{osti_1510809,
title = {What Sets the Slope of the Molecular Kennicutt–Schmidt Relation?},
author = {Semenov, Vadim A. and Kravtsov, Andrey V. and Gnedin, Nickolay Y.},
abstractNote = {The surface densities of molecular gas, ΣH2, and the star formation rate (SFR), Σ*, correlate almost linearly on kiloparsec scales in observed star-forming (non-starburst) galaxies. We explore the origin of the linear slope of this correlation using a suite of isolated galaxy L* simulations. We show that in simulations with efficient feedback, the slope of the Σ* – ΣH2 relation on kiloparsec scales is insensitive to the slope of the ρ* – ρ relation assumed at the resolution scale. We also find that the slope on kiloparsec scales depends on the criteria used to identify star-forming gas, with a linear slope arising in simulations that identify star-forming gas using a virial parameter threshold. This behavior can be understood using a simple theoretical model based on conservation of interstellar gas mass as the gas cycles between atomic, molecular, and star-forming states under the influence of feedback and dynamical processes. In particular, we show that the linear slope emerges when feedback efficiently regulates and stirs the evolution of dense, molecular gas. As a result we show that the model also provides insights into the likely origin of the relation between the SFR and molecular gas in real galaxies on different scales.},
doi = {10.3847/1538-4357/aaf163},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 870,
place = {United States},
year = {Thu Jan 10 00:00:00 EST 2019},
month = {Thu Jan 10 00:00:00 EST 2019}
}
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The effect of non-equilibrium metal cooling on the interstellar medium
text, January 2017
- Capelo, Pedro R.; Bovino, Stefano; Lupi, Alessandro
- arXiv
The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations
text, January 2017
- Lupi, Alessandro; Bovino, Stefano; Capelo, Pedro R.
- arXiv
The EDGE-CALIFA survey: the influence of galactic rotation on the molecular depletion time across the Hubble sequence
text, January 2017
- Colombo, D.; Kalinova, V.; Utomo, D.
- arXiv
On the Appearance of Thresholds in the Dynamical Model of Star Formation
text, January 2018
- Elmegreen, Bruce G.
- arXiv
The momentum budget of clustered supernova feedback in a 3D, magnetised medium
text, January 2018
- Gentry, Eric S.; Krumholz, Mark R.; Madau, Piero
- arXiv
On the Origin of the Global Schmidt Law of Star Formation
text, January 2003
- Kravtsov, Andrey V.
- arXiv
HCN Survey of Normal Spiral, IR-luminous and Ultraluminous Galaxies
text, January 2003
- Gao, Yu; Solomon, Philip M.
- arXiv
Connecting Dense Gas Tracers of Star Formation in our Galaxy to High-z Star Formation
text, January 2005
- Wu, Jingwen; Evans, Neal J.; Gao, Yu
- arXiv
Effects of Baryons and Dissipation on the Matter Power Spectrum
text, January 2007
- Rudd, Douglas H.; Zentner, Andrew R.; Kravtsov, Andrey V.
- arXiv
The Structure of Cold Dark Matter Halos
text, January 1995
- Navarro, Julio F.; Frenk, Carlos S.; White, Simon D. M.
- arXiv
Works referencing / citing this record:
H2 chemistry in galaxy simulations: an improved supernova feedback model
journal, January 2019
- Lupi, Alessandro
- Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 2
H2 chemistry in galaxy simulations: an improved supernova feedback model
text, January 2018
- Lupi, Alessandro
- arXiv